 /*******************************************************************************
  * Copyright (c) 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  ******************************************************************************/

 package org.eclipse.ui.menus;

 import org.eclipse.core.expressions.Expression;
 import org.eclipse.jface.action.IContributionItem;
 import org.eclipse.jface.action.IContributionManager;

 /**
  * Instances of this interface represent a position in the contribution
  * hierarchy into which {@link AbstractContributionFactory} instances may insert
  * elements. Instances of this interface are provided by the platform and this
  * interface should <b>NOT</b> be implemented by clients.
  *
  *
  * @since 3.3
  */
 public interface IContributionRoot {
     /**
      * Adds a given contribution item with provided visibility expression and
      * kill-switch filtering as a direct child of this container. This should be
      * called for all top-level elements created in
      * {@link AbstractContributionFactory#createContributionItems(org.eclipse.ui.services.IServiceLocator, IContributionRoot)}
      *
      * @param item
      * the item to add
      * @param visibleWhen
      * the visibility expression. May be <code>null</code>.
      */
     public void addContributionItem(IContributionItem item,
             Expression visibleWhen);

     /**
      * Registers visibilty for arbitrary {@link IContributionItem} instances
      * that are <b>NOT</b> direct children of this container. Ie: children of a
      * {@link IContributionManager} that has been previously registered with a
      * call to {{@link #addContributionItem(IContributionItem, Expression)}.
      *
      * @param item
      * the item for which to register a visibility clause
      * @param visibleWhen
      * the visibility expression. May be <code>null</code> in which
      * case this method is a no-op.
      */
     public void registerVisibilityForChild(IContributionItem item,
             Expression visibleWhen);
 }

